338 T. S. Hunt on Euphotide and Saussurite. 
The euphotide of the Fiumalto consisted of green di : 
with curved lamelle in'a white paste, whic was tender, easi ' 
cut with a knife, and had a density of 3°30 (v). It was readily — 
fusible and easily attacked by sulphuric acid, with which the 
analysis was made; the separated silica being dissolved bya — 
solution of potash which left a residue, supposed to be dial | 
and equal to 8:8 parts, which added to the above analysis makes 
the sum 1004; alkalies were absent.—(Amn. des Mines, 3), 
vili, p. 159. 
Notwithstanding the peculiarities presented by saussutile, 
modern mineralogists have generally referred it to labradonie 
or some other feldspar, (see Beudant, Bischoff, Dana, Deles, 
etc.). Jameson, separates it from the feldspars on account of 
its greater specific gravity, but recent authors seem to have él 
tirely lost sight of this characteristic. Coquand describes saus 
surite as having a density of 2°87, while according to Delesse 
is seldom inferior to 2°80. These authors agree in declaring te 
mineral to be decomposable by acids like labradonite, 7 
Bischoff and Senft, without alluding to its density, assert 
saussurite is not attacked by acids. ae 
An analysis of saussurite by Stromeyer gives the pr 
of labradorite, while Lory on the other hand has described & 
euphotide a rock from Levaldens in the Dauphinese Alps, wi 
is made up of an olive hornblende and a white min pan 
the cleavage of a feldspar and the composition of an 
i 
treated with muriatic and sulphuric acids the. bed them a8 
5523, alumina 3 
lime 6:86, magnesia 1°48, protoxyd of iron 1‘11, soda 4 wi 
99°85. The 
tide of Mt. Genévre contained diallage, a serpeD feldspat; 
jneh 
~_ crystalline laminze were —— es saul 
in length, and gave by analysis, silica 49°/9, : 
1118, magnesia 0°56, protoxyd of iron 0°85, soda #04 Fo 
0-24, water and volatile matters 3°75 = 10000. _ “fhe Te 
portion according to Delesse, at least pie rab 4}, x74} 
mainder being carbonic acid. (Ann. des 1 le bicwls 
238 and 267.) This feldspar resembles t at 863; Hime 12°02 
diorite of Corsica which gave to Delesse, silica ae 
alkalies 3°61, and 0-49 of water. | 
